Brick texture does not look realistic
There are multiple thing that contribute to it looking unrealistic. 


The lighting is very harsh. It seems like the light is coming from below, which results in the shadows being cast in an upward direction.
The bricks seem extraordinarily large if the camera is supposed to be at eye height.
The walls are extreme in both length and height, which doesn't positively contribute to realism either.


I'd suggest to develop the look of your brick material in a daytime lighting on a small plane. That way you know the material looks right, independent of scale, placement and lighting in the final scene. If the results looks good to you, apply it to your nighttime scene.